Hi guys, just 9 days into my 2'nd grow and already having problems 
It all looked perfectly fine until yesterday morning when I started seeing some weird yellowing of the young top leaves. The yellowing is uneven and more focused in the middle of the leaves not tips or sides as it would due to overfeeding.
Since I grow Hydro with coco I preety much follow C.E.'s guide I found on this site here: https://www.autoflower.org/f2/growing-coco-3789.html
but first let me answer the troubleshooting form.
A) Lights: 600W HPS dual spectrum by sunmaster + 3 extra CFL for blue spectrum.
B) Distance from tops: about 1.2 M (3.6 feet)
C) Reflector type: cool tube
D) Is there a consistent fresh air supply? Yes constant air flow
E) Do you have an exhaust fan and a circulation fan? Yes
F) What are the bulb wattages, kelvin ratings, and schedule? Not sure about kelvins, 600w, 24H except when I leave home for 1-2 hours max / day I switch to the CFL's because I fear to leave home with those hot HPS on.
G) 70L (18.5 Gallons), Attami Wilma 8 pot system. Size of 1 pot: 10L (2.5 gallon)
I grow with coco, and here comes my first suspect the brand. They didn't have anymore Canna coco that I used in my first grow so the guys I order my stuff from sent me another wich they say is just as good as Canna. It's called U-Gro XL. Anyone has any experience with this product? Also I added a few clay pebs not much just about 10% on top and 10% on bottom of the pot, that I had from my previous grow. I read somwhere this is good to prevent coco from dislodging and moving around so much. Properly flushed everything before using 3 times with canna flush and cannazym to eliminate any residues from my previous grow, ..
H) I use tap water, wich was ok on my previous attempt. Here we have 0.3 EC and 7.0 PH tap water wich I always adjust to 5.8 as C.E's guide suggests. However the coco is buffered and keeps pushing thowartds PH 6.2, wich is my second suspect. Looking at the self diagnostic page here, the only ones that look close to my problem is sulphur lockout because PH problems. Those are the only ones resembling my problem, but it's hard to tell because my plants are only 9 days old and only have 1-3 finger leaves yet.
I) Just as C.E.'s coco row guide suggests, I started feeding from day 0 with a light (0.5 EC) Bio Rhizotonic from Canna, then when the first leaves developed properly I started adding a 0.1 / day of Canna Coco A+B. At tis point the solution is at 0.9 EC. My third suspect reading the forum is maybe feeding them 3 times / day about 5 min caused a nutriend build up / lock out? I'm considering another flush in that case, but I'm not sure, what you think?
J) What is the ec/ppm of your unadjusted tap (or filtered) water? answered above^
K) What is the ec/ppm of your nutrient solution? answered above^
L) What is the temperature of your nutrient solution? (reservoir high and low temps) because it's winter here and the floor below the tank is kinda low, I added a fishtank heater set to keep the water at 20-21 C ( about 70 F) so that is constant
M) Does your ec/ppm show a rise or fall when you do your daily PPM check? Nope
N) Does the ph fluctuate? Yes, the coco is buffered and keeps pushing my PH thowards 6.2
O) Do you foliar feed? If so, with what, how often, and at what time do you
spray? (Just after lights come on, just before they go out...)
Another suspect, I did spray them with what I thought was properly PH'd water but when I started having trouble, and started checking everything I checked the water spray bottle and that also was at PH 6.4. This is weird becase I am 100% positive I checked when I prepared it and it was 5.8. Could that cause a lockout?
P) How often do you replace reservoir water/nutes? We are 9 days old, so none yet.
Q) What size of closet, room or hut? I have a Buddha room tent from ebay, 1.2mx1.2mx2m
R) What are the temps and humidity levels while lights are on? ...With lights off?
When I'm on the HPS the temp is about 25-27 degress (77-80 F) Humidity fluctuates, 30-50%
S) Have you seen signs of insects in the growroom? No
T) Are the roots long and white, or brown and slimy? Too small plants to see that yet.
Your strain:
U) What strain are you growing? (Indica dominate or Sativa dom?)
1 g13 diesel auto, 1 dinafem auto white widow, 2 afghan kush ryder, 2 pakistan kush ryder, 2 lowryder diesel ryder. (All feminized)
V) Is this an photoperiod strain? Nein
W) From seeds or clones? Seeds from Attitude website, I hear that is a trusted source is it?
Finally here are the pictures of the problem. It appeared verry sudden and the plants seem to keep growing despite it for now, I'm pretty sure they grew a bit since last nite so no sign of stunt yet.
Also browsing the forum another suspect of mine is light maybe too strong? Should I put th HPS higher? What do you guys think?
View attachment 165863View attachment 165862
Please help! Thank you!
PS only the yellow on the top are leaves, I realize now looking at the pictures theres also some yellow below but that is some paper labels on a toothpick with numbers, that I put there for identification. Also, the pictures are of the worst and second worst looking of the 8. The rest seem fine but they also start showing first signs of yellowing.
It all looked perfectly fine until yesterday morning when I started seeing some weird yellowing of the young top leaves. The yellowing is uneven and more focused in the middle of the leaves not tips or sides as it would due to overfeeding.
Since I grow Hydro with coco I preety much follow C.E.'s guide I found on this site here: https://www.autoflower.org/f2/growing-coco-3789.html
but first let me answer the troubleshooting form.
A) Lights: 600W HPS dual spectrum by sunmaster + 3 extra CFL for blue spectrum.
B) Distance from tops: about 1.2 M (3.6 feet)
C) Reflector type: cool tube
D) Is there a consistent fresh air supply? Yes constant air flow
E) Do you have an exhaust fan and a circulation fan? Yes
F) What are the bulb wattages, kelvin ratings, and schedule? Not sure about kelvins, 600w, 24H except when I leave home for 1-2 hours max / day I switch to the CFL's because I fear to leave home with those hot HPS on.
G) 70L (18.5 Gallons), Attami Wilma 8 pot system. Size of 1 pot: 10L (2.5 gallon)
I grow with coco, and here comes my first suspect the brand. They didn't have anymore Canna coco that I used in my first grow so the guys I order my stuff from sent me another wich they say is just as good as Canna. It's called U-Gro XL. Anyone has any experience with this product? Also I added a few clay pebs not much just about 10% on top and 10% on bottom of the pot, that I had from my previous grow. I read somwhere this is good to prevent coco from dislodging and moving around so much. Properly flushed everything before using 3 times with canna flush and cannazym to eliminate any residues from my previous grow, ..
H) I use tap water, wich was ok on my previous attempt. Here we have 0.3 EC and 7.0 PH tap water wich I always adjust to 5.8 as C.E's guide suggests. However the coco is buffered and keeps pushing thowartds PH 6.2, wich is my second suspect. Looking at the self diagnostic page here, the only ones that look close to my problem is sulphur lockout because PH problems. Those are the only ones resembling my problem, but it's hard to tell because my plants are only 9 days old and only have 1-3 finger leaves yet.
I) Just as C.E.'s coco row guide suggests, I started feeding from day 0 with a light (0.5 EC) Bio Rhizotonic from Canna, then when the first leaves developed properly I started adding a 0.1 / day of Canna Coco A+B. At tis point the solution is at 0.9 EC. My third suspect reading the forum is maybe feeding them 3 times / day about 5 min caused a nutriend build up / lock out? I'm considering another flush in that case, but I'm not sure, what you think?
J) What is the ec/ppm of your unadjusted tap (or filtered) water? answered above^
K) What is the ec/ppm of your nutrient solution? answered above^
L) What is the temperature of your nutrient solution? (reservoir high and low temps) because it's winter here and the floor below the tank is kinda low, I added a fishtank heater set to keep the water at 20-21 C ( about 70 F) so that is constant
M) Does your ec/ppm show a rise or fall when you do your daily PPM check? Nope
N) Does the ph fluctuate? Yes, the coco is buffered and keeps pushing my PH thowards 6.2
O) Do you foliar feed? If so, with what, how often, and at what time do you
spray? (Just after lights come on, just before they go out...)
Another suspect, I did spray them with what I thought was properly PH'd water but when I started having trouble, and started checking everything I checked the water spray bottle and that also was at PH 6.4. This is weird becase I am 100% positive I checked when I prepared it and it was 5.8. Could that cause a lockout?
P) How often do you replace reservoir water/nutes? We are 9 days old, so none yet.
Q) What size of closet, room or hut? I have a Buddha room tent from ebay, 1.2mx1.2mx2m
R) What are the temps and humidity levels while lights are on? ...With lights off?
When I'm on the HPS the temp is about 25-27 degress (77-80 F) Humidity fluctuates, 30-50%
S) Have you seen signs of insects in the growroom? No
T) Are the roots long and white, or brown and slimy? Too small plants to see that yet.
Your strain:
U) What strain are you growing? (Indica dominate or Sativa dom?)
1 g13 diesel auto, 1 dinafem auto white widow, 2 afghan kush ryder, 2 pakistan kush ryder, 2 lowryder diesel ryder. (All feminized)
V) Is this an photoperiod strain? Nein
W) From seeds or clones? Seeds from Attitude website, I hear that is a trusted source is it?
Finally here are the pictures of the problem. It appeared verry sudden and the plants seem to keep growing despite it for now, I'm pretty sure they grew a bit since last nite so no sign of stunt yet.
Also browsing the forum another suspect of mine is light maybe too strong? Should I put th HPS higher? What do you guys think?
View attachment 165863View attachment 165862
Please help! Thank you!
PS only the yellow on the top are leaves, I realize now looking at the pictures theres also some yellow below but that is some paper labels on a toothpick with numbers, that I put there for identification. Also, the pictures are of the worst and second worst looking of the 8. The rest seem fine but they also start showing first signs of yellowing.
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